oil press warning
pjrose at frontiernet.net
Sat Sep 4 13:36:45 EDT 2004
At 10:45 AM -0400 9/4/04, feelstranger wrote:
>I have a question, but first the story...
>Last week the SO was driving the 200 on a hot day along the Mass
>pike and had the oil pressure warning light beep at her several
>times. She pulled over several times and checked the oil etc (smart
>girl). It was fine (I know the light is not for the level - she may
>not have). She kept going and she said that when she shut the AC
>off it never did that again. She made it to Saratoga (in none to
>great mood) when she picked me up and we drove back to VT with no
>warnings and the oil pressure stayed in the 5 range while motoring.
>It has acted normal up till yesterday.
>So I get in the car and start it up (first time for the day I think)
>and the oil warning goes off. I look and see that the pressure
>appears pinned at the 5 position at idle. I seem to recall that the
>pressure sits a little high just after cold starts - but maybe
Cold pressure briefly at 5 bar is OK , but the gauge should return to
a lower reading (about 2 bar?) when idling a _warm_ engine.
>So the question is... Will over pressure tip off the warning?
There are two pressure sensors--low and high. So, yes, it can react
to excessive pressure. But although I've often seen 5 bar briefly
during warm-up, I've never had the pressure warning. The ECU
considers the combination of RPM and pressure (and perhaps engine
temp) to decide on whether to issue a hi/lo warning. The "critical"
RPM is about 3K, I believe. I'm sure some lister knows the exact
parameters for oil pressure warnings.
>Are there any known electrical issues with this system?
This is an Audi, right?
>I really get the feeling this is a gremlin but maybe that is just
>I'm running 20w 50 dino oil.
The 20W 50 weight could be an issue I suppose--why such a high
viscosity range? I'd guess a defective pressure sensor (not uncommon)
is the more likely culprit--something I've escaped so far (knock on
mailto:pjrose at frontiernet.net
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